diff --git a/install_mysql.sh b/install_mysql.sh
index 6ebd675..19d15e2 100755
--- a/install_mysql.sh
+++ b/install_mysql.sh
@@ -177,19 +177,22 @@ echo "Soll eine vorhanden MySQL Installation geupdateted werden?"
 echo ""
 echo "[1] Neuinstallation"
 echo "[2] Update vorhandener Installation"
+echo "[3] Parallelinstallation (nur Neuinstallation)"
 echo ""
 echononl "Eingabe: "
 
 
-while [ "$_UPDATE_MYSQL" != "update" -a "$_UPDATE_MYSQL" != "new" ];do
+while [ "$_UPDATE_MYSQL" != "update" -a "$_UPDATE_MYSQL" != "new" -a "$_UPDATE_MYSQL" != "parallel" ];do
    read OPTION
    case $OPTION in
          1)      _UPDATE_MYSQL="new"
          ;;
          2)      _UPDATE_MYSQL="update"
          ;;
+         3)      _UPDATE_MYSQL="parallel"
+         ;;
          *)    echo ""  
-               echo -e "\tFalsche Eingabe ! [ 1 = Neuinstallation ; 2 = Update ]"
+               echo -e "\tFalsche Eingabe ! [ 1 = Neuinstallation ; 2 = Update ; 3 = Parallelinstallation]"
                echo ""
                echononl "Eingabe:"
          ;;
@@ -201,6 +204,12 @@ else
    UPDATE_MYSQL=false
 fi
 
+if [ "$_UPDATE_MYSQL" = "parallel" ];then
+   PARALLEL_INSTALLATION=true
+else
+   PARALLEL_INSTALLATION=false
+fi
+
 if ! $UPDATE_MYSQL ; then
 
 	MYSQL_DISTRIBUTION=
@@ -233,6 +242,21 @@ if ! $UPDATE_MYSQL ; then
 	done
 fi
 
+
+if [[ -n "$(which mysqld)" ]] ; then
+
+   if $PARALLEL_INSTALLATION && ! $UPDATE_MYSQL ; then
+      fatal "Found binary '$(which mysqld)', but you are not in update mode!"
+   fi
+
+else
+
+   if $UPDATE_MYSQL ; then
+      fatal "No installed MySQL server or distribution found, but you are in update mode!"
+   fi
+
+fi
+
 if $UPDATE_MYSQL ; then
 
 	_MYSQLD_VERSION="$(mysqld -V 2>/dev/null)"
@@ -252,7 +276,7 @@ if $UPDATE_MYSQL ; then
    echo_ok
 
    echononl "Get current MySQL Version.."
-   CURRENT_VERSION="$(echo $_MYSQLD_VERSION | grep -o -E "[0-9]+\.[0-9]+\.[0-9]+(-[0-9]+)?" | head -n 1)"
+   CURRENT_VERSION="$(echo $_MYSQLD_VERSION | grep -o -E "[0-9]+\.[0-9]+\.[0-9]+(-[0-9]+)?")"
    CURRENT_MAIN_VERSION="$(echo $MYSQL_VERSION | cut -d '.' -f1,2)"
    if [[ -n "$CURRENT_VERSION" ]]; then
       echo_ok
@@ -298,7 +322,6 @@ if $UPDATE_MYSQL ; then
       done
 
    fi
-
 fi
 
 
@@ -448,6 +471,10 @@ if $UPDATE_MYSQL ; then
 fi
 
 
+if $PARALLEL_INSTALLATION ; then
+   _MYSQL_LOG_DIR="$(dirname "$_MYSQL_LOG_DIR")/${MYSQL_DISTRIBUTION,,}-${MYSQL_VERSION}"
+fi
+
 echo ""
 echo -e "\033[32m--\033[m"
 echo ""
@@ -463,10 +490,30 @@ do
    fi
 done
 
+if $PARALLEL_INSTALLATION ; then
+
+   declare -i _port=3307
+
+   while [[ $_port -lt 3316 ]] ; do
+      if $(netstat -tlnp | grep mysql | grep -q ":$_port" 2> /dev/null) ; then
+         ((_port++))
+         continue
+      else
+         _MYSQL_PORT=$_port
+         break
+      fi
+   done
+
+   if $(netstat -tlnp | grep mysql | grep -q ":$_MYSQL_PORT" 2> /dev/null) ; then
+      fatal "To many parallel installations"
+   fi
+
+fi
+
 echo ""
 echo -e "\033[32m--\033[m"
 echo ""
-echo "Gib den TCP Port für MySQL an (voreingestell \"${MYSQL_PORT}\")."
+echo "Gib den TCP Port für MySQL an (voreingestell \"${_MYSQL_PORT}\")."
 echo ""
 MYSQL_PORT=
 while [ "X$MYSQL_PORT" = "X" ]
@@ -478,6 +525,11 @@ do
    fi
 done
 
+
+if $PARALLEL_INSTALLATION ; then
+   _MYSQL_UNIX_SOCKET="/tmp/${MYSQL_DISTRIBUTION,,}-${MYSQL_VERSION}.sock"
+fi
+
 echo ""
 echo -e "\033[32m--\033[m"
 echo ""
@@ -567,55 +619,64 @@ do
    fi
 done
 
-
-__SYMLINK_INSTALL_DIR=ja
-__SYMLINK_DATA_DIR=ja
-
-echo -e "\033[32m--\033[m"
-echo ""
-echo "Symlinks:"
-echo ""
-echo "   - Setze Sysmlink for das Installationsverzeichnis `dirname $MYSQL_INSTALL_DIR`/mysql"
-echo "   - Setze Sysmlink for das Datenverzeichnis `dirname $MYSQL_DATA_DIR`/mysql"
-echo ""
-      
-echo ""
-_SYMLINK_INSTALL_DIR=""
-echononl "Sysmlink für das Installationsverzeichnis? (ja/nein) [${__SYMLINK_INSTALL_DIR}]: "
-read _SYMLINK_INSTALL_DIR
-if [ "X$_SYMLINK_INSTALL_DIR" = "X" ];then
-   _SYMLINK_INSTALL_DIR=$__SYMLINK_INSTALL_DIR
-fi
-
-_SYMLINK_INSTALL_DIR="$(echo "$_SYMLINK_INSTALL_DIR" | tr '[:upper:]' '[:lower:]')"
-while [ "$_SYMLINK_INSTALL_DIR" != "ja"  -a "$_SYMLINK_INSTALL_DIR" != "nein" ]; do
-   echononl "Falsche Eingabe. (ja/nein): "
-   read _SYMLINK_INSTALL_DIR
-done
-if [ "$_SYMLINK_INSTALL_DIR" = "ja" -o "$_SYMLINK_INSTALL_DIR" = "Ja" ]; then
-   SYMLINK_INSTALL_DIR=true
-else
+if $PARALLEL_INSTALLATION ; then
    SYMLINK_INSTALL_DIR=false
-fi
-      
-echo ""
-_SYMLINK_DATA_DIR=""
-echononl "Sysmlink für das Datenverzeichnis? (ja/nein) [${__SYMLINK_DATA_DIR}]: "
-read _SYMLINK_DATA_DIR
-if [ "X$_SYMLINK_DATA_DIR" = "X" ];then
-   _SYMLINK_DATA_DIR=$__SYMLINK_DATA_DIR
-fi
-
-__SYMLINK_DATA_DIR="$(echo "$_SYMLINK_DATA_DIR" | tr '[:upper:]' '[:lower:]')"
-while [ "$_SYMLINK_DATA_DIR" != "ja" -a "$_SYMLINK_DATA_DIR" != "nein" ]; do
-   echononl "Falsche Eingabe. (ja/nein): "
-   read _SYMLINK_DATA_DIR
-done
-if [ "$_SYMLINK_DATA_DIR" = "ja" -o "$_SYMLINK_DATA_DIR" = "Ja" ]; then
-   SYMLINK_DATA_DIR=true
-else
    SYMLINK_DATA_DIR=false
 fi
+   
+
+if ! $PARALLEL_INSTALLATION ; then
+
+   __SYMLINK_INSTALL_DIR=ja
+   __SYMLINK_DATA_DIR=ja
+
+   echo -e "\033[32m--\033[m"
+   echo ""
+   echo "Symlinks:"
+   echo ""
+   echo "   - Setze Sysmlink for das Installationsverzeichnis `dirname $MYSQL_INSTALL_DIR`/mysql"
+   echo "   - Setze Sysmlink for das Datenverzeichnis `dirname $MYSQL_DATA_DIR`/mysql"
+   echo ""
+         
+   echo ""
+   _SYMLINK_INSTALL_DIR=""
+   echononl "Sysmlink für das Installationsverzeichnis? (ja/nein) [${__SYMLINK_INSTALL_DIR}]: "
+   read _SYMLINK_INSTALL_DIR
+   if [ "X$_SYMLINK_INSTALL_DIR" = "X" ];then
+      _SYMLINK_INSTALL_DIR=$__SYMLINK_INSTALL_DIR
+   fi
+
+   _SYMLINK_INSTALL_DIR="$(echo "$_SYMLINK_INSTALL_DIR" | tr '[:upper:]' '[:lower:]')"
+   while [ "$_SYMLINK_INSTALL_DIR" != "ja"  -a "$_SYMLINK_INSTALL_DIR" != "nein" ]; do
+      echononl "Falsche Eingabe. (ja/nein): "
+      read _SYMLINK_INSTALL_DIR
+   done
+   if [ "$_SYMLINK_INSTALL_DIR" = "ja" -o "$_SYMLINK_INSTALL_DIR" = "Ja" ]; then
+      SYMLINK_INSTALL_DIR=true
+   else
+      SYMLINK_INSTALL_DIR=false
+   fi
+         
+   echo ""
+   _SYMLINK_DATA_DIR=""
+   echononl "Sysmlink für das Datenverzeichnis? (ja/nein) [${__SYMLINK_DATA_DIR}]: "
+   read _SYMLINK_DATA_DIR
+   if [ "X$_SYMLINK_DATA_DIR" = "X" ];then
+      _SYMLINK_DATA_DIR=$__SYMLINK_DATA_DIR
+   fi
+
+   __SYMLINK_DATA_DIR="$(echo "$_SYMLINK_DATA_DIR" | tr '[:upper:]' '[:lower:]')"
+   while [ "$_SYMLINK_DATA_DIR" != "ja" -a "$_SYMLINK_DATA_DIR" != "nein" ]; do
+      echononl "Falsche Eingabe. (ja/nein): "
+      read _SYMLINK_DATA_DIR
+   done
+   if [ "$_SYMLINK_DATA_DIR" = "ja" -o "$_SYMLINK_DATA_DIR" = "Ja" ]; then
+      SYMLINK_DATA_DIR=true
+   else
+      SYMLINK_DATA_DIR=false
+   fi
+
+fi # if ! $PARALLEL_INSTALLATION ; then
 
 
 
@@ -655,8 +716,13 @@ else
       echo ""
       echo "Wie soll der MySQL Datenbank Service getsartet werden?"
       echo ""
-      echo "[1] SysVinit script mysql.server"
-      echo -e "[2] \033[37m\033[1mSystemd service mysqld.service\033[m"
+      if $PARALLEL_INSTALLATION ; then
+         echo "[1] SysVinit script ${MYSQL_DISTRIBUTION,,}-${MYSQL_VERSION}.server"
+         echo -e "[2] \033[37m\033[1mSystemd service ${MYSQL_DISTRIBUTION,,}-${MYSQL_VERSION}.service\033[m"
+      else
+         echo "[1] SysVinit script mysql.server"
+         echo -e "[2] \033[37m\033[1mSystemd service mysqld.service\033[m"
+      fi
       echo ""
       echo "" 
       echo "Type a number or press <RETURN> to choose highlighted value"
@@ -691,14 +757,23 @@ MYSQL_SERVICE_FILE=""
 MYSQL_SYSV_INIT_SCRIPT=""
 SYSTEMD_PID_DIR=""
 if $INSTALL_SYSTEMD_SERVICE ; then
-   if [[ "$MYSQL_DISTRIBUTION" = "MariaDB" ]]; then
+
+   if $PARALLEL_INSTALLATION ; then
+      MYSQL_SERVICE_FILE="${MYSQL_DISTRIBUTION,,}-${MYSQL_VERSION}.service"
+      SYSTEMD_PID_DIR="$MYSQL_DATA_DIR"
+   elif [[ "$MYSQL_DISTRIBUTION" = "MariaDB" ]]; then
       MYSQL_SERVICE_FILE="mariadb.service"
    else
       MYSQL_SERVICE_FILE="mysqld.service"
       SYSTEMD_PID_DIR="$MYSQL_DATA_DIR"
    fi
 else
-   MYSQL_SYSV_INIT_SCRIPT="mysql.server"
+   if $PARALLEL_INSTALLATION ; then
+      MYSQL_SYSV_INIT_SCRIPT="${MYSQL_DISTRIBUTION,,}-${MYSQL_VERSION}.server"
+      SUPPORT_FILE_INIT_SCRIPT="mysql.server"
+   else
+      MYSQL_SYSV_INIT_SCRIPT="mysql.server"
+   fi
 fi
 
 
@@ -910,48 +985,43 @@ echo "SYSTEMD_PID_DIR=$SYSTEMD_PID_DIR" >> ${logdir}/main.log
 echo "MYSQL_SYSV_INIT_SCRIPT=$MYSQL_SYSV_INIT_SCRIPT" >> ${logdir}/main.log
 echo "VSERVER_GUEST=$VSERVER_GUEST" >> ${logdir}/main.log
 
-MYSQL_INIT_SCRIPT="" 
-MYSQLD_SERVICE_FILE="" 
-if $SYSTEMD_EXISTS ; then 
-	if [[ -f "/etc/systemd/system/$MYSQL_SERVICE_FILE" ]]; then
-		MYSQLD_SERVICE_FILE="${MYSQL_SERVICE_FILE}"
-	else
-		# - Is Service exclusive controlled by systemd 
-		# - 
-		if systemctl -t service list-unit-files \
-				| grep -e "^mysql" \
-				| grep -q -E "(enabled|disabled|generated)" 2> /devnull ; then 
 
-			MYSQLD_SERVICE_FILE=$(systemctl -t service list-unit-files \
-											| grep -e "^mysql" \
-											| awk '{print$1}' \
-											| head -1)
-		fi 
-	fi
+if ! $PARALLEL_INSTALLATION ; then
 
-fi 
+   MYSQL_INIT_SCRIPT="" 
+   MYSQLD_SERVICE_FILE="" 
+   if $SYSTEMD_EXISTS ; then 
+      if [[ -f "/etc/systemd/system/$MYSQL_SERVICE_FILE" ]]; then
+         MYSQLD_SERVICE_FILE="${MYSQL_SERVICE_FILE}"
+      else
+         # - Is Service exclusive controlled by systemd 
+         # - 
+         if systemctl -t service list-unit-files \
+               | grep -e "^mysql" \
+               | grep -q -E "(enabled|disabled|generated)" 2> /devnull ; then 
 
-if [[ -f "/etc/systemd/system/$MYSQL_SERVICE_FILE" ]]; then
-	MYSQL_INIT_SCRIPT="${MYSQL_SYSV_INIT_SCRIPT}"
-elif [[ -x "$(realpath /etc/init.d/mysql.server)" ]]; then 
-	MYSQL_INIT_SCRIPT="mysql.server" 
-elif [[ -x "$(realpath /etc/init.d/mysql)" ]]; then 
-	MYSQL_INIT_SCRIPT="mysql" 
-fi 
+            MYSQLD_SERVICE_FILE=$(systemctl -t service list-unit-files \
+                                    | grep -e "^mysql" \
+                                    | awk '{print$1}' \
+                                    | head -1)
+         fi 
+      fi
 
-if [[ -z "$MYSQL_INIT_SCRIPT" ]] && [[ -z "$MYSQLD_SERVICE_FILE" ]] && $UPDATE_MYSQL ; then
-   error "Kein start/stop Sevice File/ Init Script gefunden.."
+   fi 
 
-   echononl "continue anyway [yes/no]: "
-   read OK
-   OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
-   while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
-      echononl "Wrong entry! - repeat [yes/nno]: "
-      read OK
-   done
-   [[ $OK = "yes" ]] || fatal "Abbruch durch User"
+   if [[ -f "/etc/systemd/system/$MYSQL_SERVICE_FILE" ]]; then
+      MYSQL_INIT_SCRIPT="${MYSQL_SYSV_INIT_SCRIPT}"
+   elif [[ -x "$(realpath /etc/init.d/mysql.server)" ]]; then 
+      MYSQL_INIT_SCRIPT="mysql.server" 
+   elif [[ -x "$(realpath /etc/init.d/mysql)" ]]; then 
+      MYSQL_INIT_SCRIPT="mysql" 
+   fi 
 
-fi
+   if [[ -z "$MYSQL_INIT_SCRIPT" ]] && [[ -z "$MYSQLD_SERVICE_FILE" ]] && $UPDATE_MYSQL ; then
+      fatal "Kein start/stop Sevice File/ Init Script gefunden.."
+   fi
+
+fi # if ! $PARALLEL_INSTALLATION ; then
 
 
 ## ---
@@ -1086,169 +1156,181 @@ fi
 ## - Stop MySQL Service if running
 ## -
 echononl "Stop MySQL Service.."
-PIDS="$(ps aux | grep -E "(bin/mysqld_safe |bin/mysqld )" | grep -v grep | awk '{print$2}')"
-if [[ "X${PIDS}X" != "XX" ]];then
-   echo "" >> ${logdir}/main.log
-   echo "## - Stop MySQL Service" >> ${logdir}/main.log
-   echo "## -" >> ${logdir}/main.log
-   if $SYSTEMD_EXISTS ; then
-      if [[ -n "$MYSQLD_SERVICE_FILE" ]] ; then
-         echo "systemctl stop ${MYSQLD_SERVICE_FILE}" >> ${logdir}/main.log
-         systemctl stop ${MYSQLD_SERVICE_FILE} >> ${logdir}/main.log 2>&1
-      else
-         echo "systemctl stop ${MYSQL_INIT_SCRIPT}" >> ${logdir}/main.log
-         systemctl stop ${MYSQL_INIT_SCRIPT} >> ${logdir}/main.log 2>&1
-      fi
-   else
-      echo "/etc/init.d/$MYSQL_INIT_SCRIPT stop" >> ${logdir}/main.log
-      /etc/init.d/$MYSQL_INIT_SCRIPT stop  >> ${logdir}/main.log 2>&1
-   fi
+if $PARALLEL_INSTALLATION || ! $UPDATE_MYSQL; then
+   echo_skipped
+else
+   _pid_string="${MYSQL_CUR_DISTRIBUTION,,}-${CURRENT_VERSION}/bin/(mysqld_safe |mysqld )"
+   PIDS="$(ps aux | grep -E "$_pid_string" | grep -v grep | awk '{print$2}')"
 
-   sleep 5
-
-   PIDS="$(ps aux | grep -E "(bin/mysqld_safe |bin/mysqld )" | grep -v grep | awk '{print$2}')"
-   if [[ -z "${PIDS}" ]]; then
-      echo_ok
-   else
-      echo_failed
-
-      echononl "Abbruch (kill -9) aller mysqld Prozesse.."
+   if [[ "X${PIDS}X" != "XX" ]];then
       echo "" >> ${logdir}/main.log
-		echo "## - Abbruch (kill -9) aller mysqld Prozesse" >> ${logdir}/main.log
-		echo "## -" >> ${logdir}/main.log
-
-      declare -i i=0
-
-      while [[ -n "$PIDS" ]] ; do
-
-         if [[ $i -gt 10 ]]; then
-            echo_failed
-            error "Killing remaining MySQL processes failed!"
-            break
+      echo "## - Stop MySQL Service" >> ${logdir}/main.log
+      echo "## -" >> ${logdir}/main.log
+      if $SYSTEMD_EXISTS ; then
+         if [[ -n "$MYSQLD_SERVICE_FILE" ]] ; then
+            echo "systemctl stop ${MYSQLD_SERVICE_FILE}" >> ${logdir}/main.log
+            systemctl stop ${MYSQLD_SERVICE_FILE} >> ${logdir}/main.log 2>&1
+         else
+            echo "systemctl stop ${MYSQL_INIT_SCRIPT}" >> ${logdir}/main.log
+            systemctl stop ${MYSQL_INIT_SCRIPT} >> ${logdir}/main.log 2>&1
          fi
+      else
+         echo "/etc/init.d/$MYSQL_INIT_SCRIPT stop" >> ${logdir}/main.log
+         /etc/init.d/$MYSQL_INIT_SCRIPT stop  >> ${logdir}/main.log 2>&1
+      fi
 
-         for _PID in $PIDS ; do
-            echo "kill -9 $_PID" >> ${logdir}/main.log
-            kill -9 $_PID >> ${logdir}/main.log 2>&1
+      sleep 5
+
+      PIDS="$(ps aux | grep -E "$_pid_string" | grep -v grep | awk '{print$2}')"
+      if [[ -z "${PIDS}" ]]; then
+         echo_ok
+      else
+         echo_failed
+
+         echononl "Abbruch (kill -9) aller mysqld Prozesse.."
+         echo "" >> ${logdir}/main.log
+         echo "## - Abbruch (kill -9) aller mysqld Prozesse" >> ${logdir}/main.log
+         echo "## -" >> ${logdir}/main.log
+
+         declare -i i=0
+
+         while [[ -n "$PIDS" ]] ; do
+
+            if [[ $i -gt 10 ]]; then
+               echo_failed
+               error "Killing remaining MySQL processes failed!"
+               break
+            fi
+
+            for _PID in $PIDS ; do
+               echo "kill -9 $_PID" >> ${logdir}/main.log
+               kill -9 $_PID >> ${logdir}/main.log 2>&1
+            done
+
+            sleep 2
+
+            PIDS="$(ps aux | grep -E "(bin/mysqld_safe |bin/mysqld )" | grep -v grep | awk '{print$2}')"
+            (( i++ ))
          done
 
-         sleep 2
-
-         PIDS="$(ps aux | grep -E "(bin/mysqld_safe |bin/mysqld )" | grep -v grep | awk '{print$2}')"
-         (( i++ ))
-      done
-
-      [[ $i -le 10 ]] && echo_ok
+         [[ $i -le 10 ]] && echo_ok
+      fi
+   else
+      echo_skipped
    fi
-else
-   echo_skipped
-fi
+
+fi # if $PARALLEL_INSTALLATION ; then
 
 ## ----- 
 ## - Deactivate starting MySQL database service at boot time and
 ## - cleanup System from SysVinit script and/or Systemd service file
 ## -----
-if [[ -n "$MYSQL_INIT_SCRIPT" ]] || [[ -n "$MYSQLD_SERVICE_FILE" ]]; then
-   echo ""
-   echo ""
-   echo -e "\033[37m\033[1mDeactivate starting MySQL database service at boot time and"
-   echo -e "cleanup System from SysVinit script and/or Systemd service file.\033[m"
-   echo ""
 
-   echo "" >> ${logdir}/main.log
-   echo "" >> ${logdir}/main.log
-   echo "## -----" >> ${logdir}/main.log
-   echo "## - Deactivate starting MySQL database service at boot time and" >> ${logdir}/main.log
-   echo "## - cleanup System from SysVinit script and/or Systemd service file." >> ${logdir}/main.log
-   echo "## -----" >> ${logdir}/main.log
-fi
+if ! $PARALLEL_INSTALLATION ; then
 
-if [[ -n "$MYSQL_INIT_SCRIPT" ]] ; then
+   if [[ -n "$MYSQL_INIT_SCRIPT" ]] || [[ -n "$MYSQLD_SERVICE_FILE" ]]; then
+      echo ""
+      echo ""
+      echo -e "\033[37m\033[1mDeactivate starting MySQL database service at boot time and"
+      echo -e "cleanup System from SysVinit script and/or Systemd service file.\033[m"
+      echo ""
 
-   if [[ -f "/etc/init.d/$MYSQL_INIT_SCRIPT" ]]; then
-      echononl "Entferne existierendes Initskript"
       echo "" >> ${logdir}/main.log
-      echo "## - Entferne existierendes Initskript" >> ${logdir}/main.log
+      echo "" >> ${logdir}/main.log
+      echo "## -----" >> ${logdir}/main.log
+      echo "## - Deactivate starting MySQL database service at boot time and" >> ${logdir}/main.log
+      echo "## - cleanup System from SysVinit script and/or Systemd service file." >> ${logdir}/main.log
+      echo "## -----" >> ${logdir}/main.log
+   fi
+
+   if [[ -n "$MYSQL_INIT_SCRIPT" ]] ; then
+
+      if [[ -f "/etc/init.d/$MYSQL_INIT_SCRIPT" ]]; then
+         echononl "Entferne existierendes Initskript"
+         echo "" >> ${logdir}/main.log
+         echo "## - Entferne existierendes Initskript" >> ${logdir}/main.log
+         echo "## -" >> ${logdir}/main.log
+         echo "rm -f /etc/init.d/$MYSQL_INIT_SCRIPT" >> ${logdir}/main.log
+         rm -f /etc/init.d/$MYSQL_INIT_SCRIPT >> ${logdir}/main.log 2>&1
+         if [ "$?" = "0" ]; then
+            echo_ok
+         else
+            echo_failed
+            fatal "Kann existierendes Initskript nicht entfernen."
+         fi
+      fi
+
+      ## - Entferne symbolische Links aus den Run Level Verzeichnissen
+      ## -
+      echononl "Entferne symbolische Links aus den Run Level Verzeichnissen"
+      echo "" >> ${logdir}/main.log
+      echo "## - Entferne symbolische Links aus den Run Level Verzeichnissen" >> ${logdir}/main.log
       echo "## -" >> ${logdir}/main.log
-      echo "rm -f /etc/init.d/$MYSQL_INIT_SCRIPT" >> ${logdir}/main.log
-      rm -f /etc/init.d/$MYSQL_INIT_SCRIPT >> ${logdir}/main.log 2>&1
+      echo "update-rc.d -f $MYSQL_INIT_SCRIPT remove" >> ${logdir}/main.log
+      update-rc.d -f $MYSQL_INIT_SCRIPT remove >> ${logdir}/main.log 2>&1
       if [ "$?" = "0" ]; then
          echo_ok
       else
          echo_failed
-         fatal "Kann existierendes Initskript nicht entfernen."
+         fatal "Kann symbolische Links (Run Level Verzeichnisse) nicht entfernen."
       fi
    fi
 
-   ## - Entferne symbolische Links aus den Run Level Verzeichnissen
-   ## -
-   echononl "Entferne symbolische Links aus den Run Level Verzeichnissen"
-   echo "" >> ${logdir}/main.log
-   echo "## - Entferne symbolische Links aus den Run Level Verzeichnissen" >> ${logdir}/main.log
-   echo "## -" >> ${logdir}/main.log
-   echo "update-rc.d -f $MYSQL_INIT_SCRIPT remove" >> ${logdir}/main.log
-   update-rc.d -f $MYSQL_INIT_SCRIPT remove >> ${logdir}/main.log 2>&1
-   if [ "$?" = "0" ]; then
-      echo_ok
-   else
-      echo_failed
-      fatal "Kann symbolische Links (Run Level Verzeichnisse) nicht entfernen."
-   fi
-fi
+   if [[ -n "$MYSQLD_SERVICE_FILE" ]]; then
 
-if [[ -n "$MYSQLD_SERVICE_FILE" ]]; then
+      echononl "Deaktiviere Systemd Service \"$MYSQLD_SERVICE_FILE\".."
+      echo "" >> ${logdir}/main.log
+      echo "## - Deaktiviere Systemd Service \"$MYSQLD_SERVICE_FILE\"" >> ${logdir}/main.log
+      echo "## -" >> ${logdir}/main.log
+      echo "systemctl disable \"$MYSQLD_SERVICE_FILE\"" >> ${logdir}/main.log
 
-   echononl "Deaktiviere Systemd Service \"$MYSQLD_SERVICE_FILE\".."
-   echo "" >> ${logdir}/main.log
-   echo "## - Deaktiviere Systemd Service \"$MYSQLD_SERVICE_FILE\"" >> ${logdir}/main.log
-   echo "## -" >> ${logdir}/main.log
-   echo "systemctl disable \"$MYSQLD_SERVICE_FILE\"" >> ${logdir}/main.log
+      systemctl disable "$MYSQLD_SERVICE_FILE" >> ${logdir}/main.log 2>&1
+      if [ "$?" = "0" ]; then
+         echo_ok
+      else
+         echo_failed
+         warn "Kann Systemd Service \"$MYSQLD_SERVICE_FILE\" nicht deaktivieren!"
+      fi
+      
+      echononl "Entferne Systemd Service \"etc/systemd/system/${MYSQLD_SERVICE_FILE}\".."
+      echo "" >> ${logdir}/main.log
+      echo "## - Enferne datei \"/etc/systemd/system/${MYSQLD_SERVICE_FILE}\"" >> ${logdir}/main.log
+      echo "## -" >> ${logdir}/main.log
+      echo "rm \"/etc/systemd/system/${MYSQLD_SERVICE_FILE}\"" >> ${logdir}/main.log
 
-   systemctl disable "$MYSQLD_SERVICE_FILE" >> ${logdir}/main.log 2>&1
-   if [ "$?" = "0" ]; then
-      echo_ok
-   else
-      echo_failed
-      warn "Kann Systemd Service \"$MYSQLD_SERVICE_FILE\" nicht deaktivieren!"
-   fi
-   
-   echononl "Entferne Systemd Service \"etc/systemd/system/${MYSQLD_SERVICE_FILE}\".."
-   echo "" >> ${logdir}/main.log
-   echo "## - Enferne datei \"/etc/systemd/system/${MYSQLD_SERVICE_FILE}\"" >> ${logdir}/main.log
-   echo "## -" >> ${logdir}/main.log
-   echo "rm \"/etc/systemd/system/${MYSQLD_SERVICE_FILE}\"" >> ${logdir}/main.log
+      rm "/etc/systemd/system/${MYSQLD_SERVICE_FILE}" >> ${logdir}/main.log 2>&1
+      if [ "$?" = "0" ]; then
+         echo_ok
+      else
+         echo_failed
+         warn "Kann existierendes Initskript nicht entfernen."
+      fi
+
+      echononl "Reload Systemd Daemon"
+      echo "" >> ${logdir}/main.log
+      echo "## - Reload Systemd Daemon" >> ${logdir}/main.log
+      echo "## -" >> ${logdir}/main.log
+      echo "systemctl daemon-reload" >> ${logdir}/main.log
+
+      systemctl daemon-reload >> ${logdir}/main.log 2>&1
+      if [ "$?" = "0" ]; then
+         echo_ok
+      else
+         echo_failed
+         error "Kann Systemd Daemon nicht reloaden."
+      fi
+      
 
-   rm "/etc/systemd/system/${MYSQLD_SERVICE_FILE}" >> ${logdir}/main.log 2>&1
-   if [ "$?" = "0" ]; then
-      echo_ok
-   else
-      echo_failed
-      warn "Kann existierendes Initskript nicht entfernen."
    fi
 
-   echononl "Reload Systemd Daemon"
-   echo "" >> ${logdir}/main.log
-   echo "## - Reload Systemd Daemon" >> ${logdir}/main.log
-   echo "## -" >> ${logdir}/main.log
-   echo "systemctl daemon-reload" >> ${logdir}/main.log
-
-   systemctl daemon-reload >> ${logdir}/main.log 2>&1
-   if [ "$?" = "0" ]; then
-      echo_ok
-   else
-      echo_failed
-      error "Kann Systemd Daemon nicht reloaden."
-   fi
-   
-
-fi
+fi # if ! $PARALLEL_INSTALLATION ; then
 
 
 ## -----
 ## - Install needed debian packages
 ## -----
 
-if ! $UPDATE_MYSQL ; then
+if ! $UPDATE_MYSQL && ! $PARALLEL_INSTALLATION ; then
 
    echo ""
    echo ""
@@ -1731,6 +1813,18 @@ else
    fatal Kann LOG Verzeichnis  \"${MYSQL_LOG_DIR}\" nicht erstellen..
 fi
 
+echononl "Erstelle Error Log Datei '$_mysql_error_log'.."
+echo "" >> ${logdir}/main.log
+echo "## - Erstelle Error Log Datei '$_mysql_error_log'.." >> ${logdir}/main.log
+echo "## -" >> ${logdir}/main.log
+echo "touch $_mysql_error_log" >> ${logdir}/main.log
+touch "$_mysql_error_log" >> ${logdir}/main.log  2>&1
+if [ "$?" = "0" ]; then
+   echo_ok
+else
+   echo_failed
+   fatal "Kann LOG Datei  \"${_mysql_error_log}\" nicht erstellen.."
+fi
 
 echononl "Setze Besitzer \"${MYSQL_USER}:${MYSQL_GROUP}\" für LOG Verzeichnis"
 echo "" >> ${logdir}/main.log
@@ -1758,6 +1852,19 @@ else
    fatal Kann Verzeichnisrechte für LOG Verzeichnis  \"${MYSQL_LOG_DIR}\" nicht ändern..
 fi
 
+echononl "Setze Verzeichnisrechte \"660\" für Error LOG Datei"
+echo "" >> ${logdir}/main.log
+echo "## - Setze Verzeichnisrechte \"660\" für Error LOG Verzeichnis" >> ${logdir}/main.log
+echo "## -" >> ${logdir}/main.log
+echo "chmod 660 ${_mysql_error_log}" >> ${logdir}/main.log
+chmod 660 ${_mysql_error_log} >> ${logdir}/main.log  2>&1
+if [ "$?" = "0" ]; then
+   echo_ok
+else
+   echo_failed
+   fatal "Kann Verzeichnisrechte für Erro LOG Datei  \"${_mysql_error_log}\" nicht ändern!"
+fi
+
 
 if [ -d "${MYSQL_SRC_DIR}" ];then
    echononl "Verschiebe exitierendes Sourceverzeichnis ..."
@@ -1897,7 +2004,7 @@ fi
 # - We change the default to empty ("") with -D INSTALL_SECURE_FILE_PRIVDIR="" option
 # -
 # ---
-# - MariaDBD
+# - MariaDB
 # ---
 # -
 # - NOT supported (in contrast to original MySQL)
@@ -2707,14 +2814,10 @@ socket		= $MYSQL_UNIX_SOCKET
 ## - sql_mode
 ## -
 ## - Since Version 8.0.11 NO_AUTO_CREATE_USER is no longer available
-## - 
-## - The default SQL mode in MySQL 8.0 includes these modes:  
-## -    ONLY_FULL_GROUP_BY, STRICT_TRANS_TABLES, NO_ZERO_IN_DATE, NO_ZERO_DATE,  
-## -    ERROR_FOR_DIVISION_BY_ZERO, and NO_ENGINE_SUBSTITUTION.
 ## -
 ## - For now, we will use the default value, it seems to be ok.
 ## -
-#sql-mode = \"ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION\"
+#sql-mode = \"ONLY_FULL_GROUP_BY,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION\"
 " >> ${logdir}/main.log
 
    else
@@ -3002,7 +3105,6 @@ innodb-file-per-table = 1
 ## -
 #innodb-buffer-pool-size = 384M
 #innodb-buffer-pool-size = 1024M
-innodb_buffer_pool_size = 1G
 
 
 ## - innodb_additional_mem_pool_size
@@ -3016,8 +3118,6 @@ innodb_buffer_pool_size = 1G
 ## -    innodb_additional_mem_pool_size is deprected since version 5.6.3
 ## -    innodb_additional_mem_pool_size is removed since version 5.7
 ## -
-## -    innodb_additional_mem_pool_size is also removed on MariaDB 10.3.x
-## -
 #innodb-additional-mem_pool-size = 20M
 #innodb-additional-mem_pool-size = 40M
 
@@ -3080,8 +3180,6 @@ innodb_buffer_pool_size = 1G
 ## -    DROP TABLE IF EXISTS..
 ## -    ...
 ## -
-## - Default: innodb-flush-log-at-trx-commit = 1
-## -
 #innodb-flush-log-at-trx-commit = 1
 #innodb-flush-log-at-trx-commit = 2
 
@@ -3106,8 +3204,7 @@ innodb_buffer_pool_size = 1G
 ## -
 ## - Default:  2097152 (2M)
 ## -
-#sort-buffer-size = 2M
-sort-buffer-size = 8M
+sort-buffer-size = 2M
 
 
 ## - key_buffer_size
@@ -3131,8 +3228,7 @@ key-buffer-size  = 384M
 ## -
 ## - Default: 131072 (128K)
 ## -
-#read-buffer-size = 2M
-read-buffer-size = 8M
+read-buffer-size = 2M
 
 ## - read_rnd_buffer_size
 ## -
@@ -3141,8 +3237,7 @@ read-buffer-size = 8M
 ## -
 ## - Default: 262144 (256K)
 ## -
-#read-rnd-buffer-size = 8M
-read-rnd-buffer-size = 32M
+read-rnd-buffer-size = 8M
 
 
 ## - myisam_sort_buffer_size
@@ -3178,8 +3273,7 @@ max-allowed-packet = 32M
 ## - closed and reopened), then you should increase the value of the 
 ## - table_open_cache variable.
 ## -
-#table-open-cache = 512
-table-open-cache = 8192
+table-open-cache = 512
 
 ## - table_definition_cache
 ## -
@@ -3217,7 +3311,7 @@ max-connect-errors = 999999
 ## -
 ## - Default: 8 + (max_connections / 100) (5.6.8) , 0 (before)
 ##  -
-#thread-cache-size = 8
+thread-cache-size = 8
 
 ## - thread_stack
 ## -
@@ -3308,7 +3402,6 @@ log-error = $_mysql_error_log
 ## -                    SELECT SQL_NO_CACHE beginnen. 
 ## -    2  : speichert nur diejenigen Anweisungen im Cache, 
 ## -                    die mit SELECT SQL_CACHE beginnen. 
-## -
 " >> ${logdir}/main.log
 
    if [[ "$MYSQL_MAJOR_VERSION" -gt 8 ]] \
@@ -3316,6 +3409,7 @@ log-error = $_mysql_error_log
       ||  ( [[ "$MYSQL_MAJOR_VERSION" -eq 8 ]] && [[ "$MYSQL_MINOR_VERSION" -eq 0 ]] \
             && [[ $MYSQL_PATCH_LEVEL -ge 3 ]] ); then
       echo "
+## -                    die mit SELECT SQL_CACHE beginnen. 
 ## - Removed since Version 8.0.3
 ## -
 #query_cache_type = 1" >> ${logdir}/main.log
@@ -3340,6 +3434,7 @@ log-error = $_mysql_error_log
       ||  ( [[ "$MYSQL_MAJOR_VERSION" -eq 8 ]] && [[ "$MYSQL_MINOR_VERSION" -eq 0 ]] \
             && [[ $MYSQL_PATCH_LEVEL -ge 3 ]] ); then
       echo "
+## -                    die mit SELECT SQL_CACHE beginnen. 
 ## - Removed since Version 8.0.3
 ## -
 #query-cache-limit = 4M" >> ${logdir}/main.log
@@ -3410,8 +3505,7 @@ log-error = $_mysql_error_log
 
    else
       echo "#query-cache-size = 32M
-#query-cache-size = 128M
-query_cache_size = 1024M" >> ${logdir}/main.log
+#query-cache-size = 128M" >> ${logdir}/main.log
    fi
 
    echo "
@@ -3487,9 +3581,6 @@ log-queries-not-using-indexes = 0
 ## - Vorgabewert ist 128K
 ## -
 #join-buffer-size = 384K
-#join_buffer_size = 768K
-join_buffer_size = 1024K
-#join_buffer_size = 1536K
 
 
 
@@ -3504,10 +3595,6 @@ join_buffer_size = 1024K
 ## - Vorgabewert ist 16Mbyte
 ## -
 #max-heap-table-size = 96M
-#max_heap_table_size = 128M
-max_heap_table_size = 768M
-#max_heap_table_size = 1024M
-#max_heap_table_size = 2048M
 
 
 ## - tmp_table_size
@@ -3524,9 +3611,6 @@ max_heap_table_size = 768M
 ## -    Effective in-memory tmp_table_size is limited to max_heap_table_size.
 ## -
 #tmp-table-size = 96M
-tmp_table_size = 768M
-#tmp_table_size = 1024M
-#tmp_table_size = 2048M
 
 
 ## - angepasste Einstellungen 
@@ -3588,14 +3672,10 @@ interactive-timeout
 ## - sql_mode
 ## -
 ## - Since Version 8.0.11 NO_AUTO_CREATE_USER is no longer available
-## - 
-## - The default SQL mode in MySQL 8.0 includes these modes:  
-## -    ONLY_FULL_GROUP_BY, STRICT_TRANS_TABLES, NO_ZERO_IN_DATE, NO_ZERO_DATE,  
-## -    ERROR_FOR_DIVISION_BY_ZERO, and NO_ENGINE_SUBSTITUTION.
 ## -
 ## - For now, we will use the default value, it seems to be ok.
 ## -
-#sql-mode = \"ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION\"
+#sql-mode = \"ONLY_FULL_GROUP_BY,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION\"
 
 EOF" >> ${logdir}/main.log
 
@@ -3932,7 +4012,7 @@ innodb-file-per-table = 1
 ## -
 #innodb-log-group-home-dir = /var/lib/mysql/
 
-## - innodb_buffer_pool_size
+## - innodb-buffer-pool-size
 ## -
 ## - The size in bytes of the buffer pool, the memory area where InnoDB 
 ## - caches table and index data.
@@ -3949,7 +4029,6 @@ innodb-file-per-table = 1
 ## -
 #innodb-buffer-pool-size = 384M
 #innodb-buffer-pool-size = 1024M
-innodb_buffer_pool_size = 1G
 
 
 ## - innodb_additional_mem_pool_size
@@ -3959,12 +4038,6 @@ innodb_buffer_pool_size = 1G
 ## -
 ## - Default: 8388608 (8M)
 ## -
-## - Note !!
-## -    innodb_additional_mem_pool_size is deprected since version 5.6.3
-## -    innodb_additional_mem_pool_size is removed since version 5.7
-## -
-## -    innodb_additional_mem_pool_size is also removed on MariaDB 10.3.x
-## -
 #innodb-additional-mem-pool-size = 20M
 #innodb-additional-mem-pool-size = 40M
 
@@ -4027,8 +4100,6 @@ innodb_buffer_pool_size = 1G
 ## -    DROP TABLE IF EXISTS..
 ## -    ...
 ## -
-## - Default: innodb-flush-log-at-trx-commit = 1
-## -
 #innodb-flush-log-at-trx-commit = 1
 #innodb-flush-log-at-trx-commit = 2
 
@@ -4053,8 +4124,7 @@ innodb_buffer_pool_size = 1G
 ## -
 ## - Default:  2097152 (2M)
 ## -
-#sort-buffer-size = 2M
-sort-buffer-size = 8M
+sort-buffer-size = 2M
 
 
 ## - key_buffer_size
@@ -4078,9 +4148,7 @@ key-buffer-size  = 384M
 ## -
 ## - Default: 131072 (128K)
 ## -
-#read-buffer-size = 2M
-read-buffer-size = 8M
-
+read-buffer-size = 2M
 
 ## - read_rnd_buffer_size
 ## -
@@ -4089,8 +4157,7 @@ read-buffer-size = 8M
 ## -
 ## - Default: 262144 (256K)
 ## -
-#read-rnd-buffer-size = 8M
-read-rnd-buffer-size = 32M
+read-rnd-buffer-size = 8M
 
 
 ## - myisam_sort_buffer_size
@@ -4126,8 +4193,7 @@ max-allowed-packet = 32M
 ## - closed and reopened), then you should increase the value of the 
 ## - table_open_cache variable.
 ## -
-#table-open-cache = 512
-table-open-cache = 8192
+table-open-cache = 512
 
 ## - table_definition_cache
 ## -
@@ -4165,7 +4231,7 @@ max-connect-errors = 999999
 ## -
 ## - Default: 8 + (max_connections / 100) (5.6.8) , 0 (before)
 ##  -
-#thread-cache-size = 8
+thread-cache-size = 8
 
 ## - thread_stack
 ## -
@@ -4291,6 +4357,7 @@ EOF
             && [[ $MYSQL_PATCH_LEVEL -ge 3 ]] ); then
 
       cat << EOF >> ${MYSQL_INSTALL_DIR}/etc/my.cnf
+## -
 ## - Removed since MySQL Version 8.0.3
 ## -
 #query-cache-limit = 4M
@@ -4367,9 +4434,7 @@ EOF
 EOF
    else
       cat << EOF >> ${MYSQL_INSTALL_DIR}/etc/my.cnf
-#query_cache_size = 32M
-#query-cache-size = 128M
-query-cache-size = 1024M
+query-cache-size = 128M
 EOF
    fi
 
@@ -4446,9 +4511,6 @@ log-queries-not-using-indexes = 0
 ## - Vorgabewert ist 128K
 ## -
 #join-buffer-size = 384K
-join_buffer_size = 768K
-#join_buffer_size = 1024K
-#join_buffer_size = 1536K
 
 
 
@@ -4463,10 +4525,6 @@ join_buffer_size = 768K
 ## - Vorgabewert ist 16Mbyte
 ## -
 #max-heap-table-size = 96M
-#max_heap_table_size = 128M
-max_heap_table_size = 768M
-#max_heap_table_size = 1024M
-#max_heap_table_size = 2048M
 
 
 ## - tmp_table_size
@@ -4483,9 +4541,6 @@ max_heap_table_size = 768M
 ## -    Effective in-memory tmp_table_size is limited to max_heap_table_size.
 ## -
 #tmp-table-size = 96M
-tmp_table_size = 768M
-#tmp_table_size = 1024M
-#tmp_table_size = 2048M
 
 
 ## - angepasste Einstellungen 
@@ -4571,6 +4626,34 @@ EOF
       error Konnte Konfigurationsdatei \"${MYSQL_INSTALL_DIR}/etc/my.cnf\" nicht erstellen..
    fi
 
+   if [[ -f "${MYSQL_INSTALL_DIR}/my.cnf" ]]; then
+      echononl "Backup existing file '${MYSQL_INSTALL_DIR}/my.cnf'.."
+      echo "" >> ${logdir}/main.log
+      echo "## - Backup existing file '${MYSQL_INSTALL_DIR}/my.cnf'.." >> ${logdir}/main.log
+      echo "## -" >> ${logdir}/main.log
+      echo "mv \"${MYSQL_INSTALL_DIR}/my.cnf\" \"${MYSQL_INSTALL_DIR}/my.cnf.ORIG\"" >> ${logdir}/main.log
+      mv "${MYSQL_INSTALL_DIR}/my.cnf" "${MYSQL_INSTALL_DIR}/my.cnf.ORIG" >> ${logdir}/main.log 2>&1
+      if [ "$?" = "0" ]; then
+         echo_ok
+      else
+         echo_failed
+         error "Kann datei '${MYSQL_INSTALL_DIR}/my.cnf' nicht sichern!"
+      fi
+   fi
+
+   echononl "Erstelle Symlink ${MYSQL_INSTALL_DIR}/my.cnf --> ${MYSQL_INSTALL_DIR}/etc/my.cnf"
+   echo "" >> ${logdir}/main.log
+   echo "## - Erstelle Symlink ${MYSQL_INSTALL_DIR}/my.cnf --> ${MYSQL_INSTALL_DIR}/etc/my.cnf" >> ${logdir}/main.log
+   echo "## -" >> ${logdir}/main.log
+   echo "ln -s \"etc/my.cnf\" \"${MYSQL_INSTALL_DIR}/my.cnf\"" >> ${logdir}/main.log
+   ln -s "etc/my.cnf" "${MYSQL_INSTALL_DIR}/my.cnf" >> ${logdir}/main.log 2>&1
+   if [ "$?" = "0" ]; then
+      echo_ok
+   else
+      echo_failed
+      error "Kann Symlink ${MYSQL_INSTALL_DIR}/my.cnf --> ${MYSQL_INSTALL_DIR}/etc/my.cnf nicht erstellen!"
+   fi
+
 fi
 
 if [[ ! -d "/etc/mysql" ]]; then
@@ -4603,23 +4686,47 @@ else
       else
          echo_failed
          error "Konnte Symlink/Datei '/etc/mysql/my.cnf' nicht sichern."
+
+         echononl "continue anyway [yes/no]: "
+         read OK
+         OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+         while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+            echononl "Wrong entry! - repeat [yes/nno]: "
+            read OK
+         done
+         [[ $OK = "yes" ]] || fatal "Abbruch durch User"
       fi
    fi
 
 fi
 
 echononl "Erstelle Symlink /etc/mysql/my.cnf --> ${MYSQL_INSTALL_DIR}/etc/my.cnf"
-echo "" >> ${logdir}/main.log
-echo "## - Erstelle Symlink /etc/mysql/my.cnf --> ${MYSQL_INSTALL_DIR}/etc/my.cnf" >> ${logdir}/main.log
-echo "## -" >> ${logdir}/main.log
-echo "ln -s \"$(dirname \"${MYSQL_INSTALL_DIR}\")/mysql/etc/my.cnf\"  \"/etc/mysql/\"" >> ${logdir}/main.log
-ln -s "$(dirname "${MYSQL_INSTALL_DIR}")/mysql/etc/my.cnf"  "/etc/mysql/my.cnf" >> ${logdir}/main.log  2>&1
-if [ "$?" = "0" ]; then
-   echo_ok
+if ! $PARALLEL_INSTALLATION ; then
+
+   echo "" >> ${logdir}/main.log
+   echo "## - Erstelle Symlink /etc/mysql/my.cnf --> ${MYSQL_INSTALL_DIR}/etc/my.cnf" >> ${logdir}/main.log
+   echo "## -" >> ${logdir}/main.log
+   echo "ln -s \"$(dirname "${MYSQL_INSTALL_DIR}")/mysql/etc/my.cnf\"  \"/etc/mysql/\"" >> ${logdir}/main.log
+   ln -s "$(dirname "${MYSQL_INSTALL_DIR}")/mysql/etc/my.cnf"  "/etc/mysql/my.cnf" >> ${logdir}/main.log  2>&1
+   if [ "$?" = "0" ]; then
+      echo_ok
+   else
+      echo_failed
+      error "Konnte Symlink /etc/mysql/my.cnf --> ${MYSQL_INSTALL_DIR}/etc/my.cnf nicht erstellen."
+
+      echononl "continue anyway [yes/no]: "
+      read OK
+      OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+      while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+         echononl "Wrong entry! - repeat [yes/nno]: "
+         read OK
+      done
+      [[ $OK = "yes" ]] || fatal "Abbruch durch User"
+   fi
+
 else
-   echo_failed
-   error "Konnte Symlink /etc/mysql/my.cnf --> ${MYSQL_INSTALL_DIR}/etc/my.cnf nicht erstellen."
-fi
+   echo_skipped
+fi # if ! $PARALLEL_INSTALLATION ; then
 
 
 echononl "Kopiere 'stopwords_utf8_iso8859-15.txt' -> ${MYSQL_INSTALL_DIR}.."
@@ -4714,6 +4821,67 @@ if $INSTALL_SYSTEMD_SERVICE ; then
       error "Setting open_files_limit (LimitNOFILE) to $(ulimit -Hn) failed!"
    fi
 
+   if $PARALLEL_INSTALLATION ; then
+
+      SYSTEMD_ENV_FILE="/etc/systemd/system/${MYSQL_DISTRIBUTION,,}-${MYSQL_VERSION}.env"
+
+      echononl "Create environmet file fo systemd service.."
+      echo "" >> ${logdir}/main.log
+      echo "## - Create environmet file fo systemd service.." >> ${logdir}/main.log
+      echo "## -" >> ${logdir}/main.log
+      echo "cat <<EOF > $SYSTEMD_ENV_FILE
+MYSQL_HOME=\"$MYSQL_INSTALL_DIR\"
+EOF
+" >> ${logdir}/main.log
+      if [[ $? -eq 0 ]] ; then
+         echo_ok
+      else
+         echo_failed
+         error "Creating environmet file fo systemd service failed!"
+      fi
+      cat <<EOF > $SYSTEMD_ENV_FILE
+MYSQL_HOME="$MYSQL_INSTALL_DIR"
+EOF
+
+      echononl "Add/Replace 'EnvironmentFile' variable at service file .."
+      echo "" >> ${logdir}/main.log
+      echo "## - Add/Replace 'EnvironmentFile' variable at service file .." >> ${logdir}/main.log
+      echo "## -" >> ${logdir}/main.log
+
+      if grep -q -E "^\s*EnvironmentFile\s*=" /etc/systemd/system/$MYSQL_SERVICE_FILE ; then
+         echo "perl -i -n -p -e \"s/^(\s*EnvironmentFile\s*=.*)/#\1\nEnvironmentFile=-${SYSTEMD_ENV_FILE}\" /etc/systemd/system/$MYSQL_SERVICE_FILE" >> ${logdir}/main.log
+         perl -i -n -p -e "s/^(\s*EnvironmentFile\s*=.*)/#\1\nEnvironmentFile=-${SYSTEMD_ENV_FILE}/" \
+            /etc/systemd/system/$MYSQL_SERVICE_FILE >> ${logdir}/main.log 2>&1
+         _retval=$?
+      else
+         echo "cat <<EOF >> /etc/systemd/system/$MYSQL_SERVICE_FILE
+
+EnvironmentFile=-$SYSTEMD_ENV_FILE
+EOF" >> ${logdir}/main.log 2>&1
+         cat <<EOF >> /etc/systemd/system/$MYSQL_SERVICE_FILE 2>> ${logdir}/main.log
+
+EnvironmentFile=-$SYSTEMD_ENV_FILE
+EOF
+         _retval=$?
+      fi
+      if [ "$_retval" = "0" ]; then
+         echo_ok
+      else
+         echo_failed
+         error "Adding/Replacing 'EnvironmentFile' variable at service file failed!"
+      fi
+
+      if grep -q -E "^\s*Alias\s*=" /etc/systemd/system/$MYSQL_SERVICE_FILE ; then
+         echononl "Disable 'Alias' directive(s) at service file.." 
+         echo "" >> ${logdir}/main.log
+         echo "## - Disable 'Alias' directive(s) at service file.." >> ${logdir}/main.log
+         echo "## -" >> ${logdir}/main.log
+         echo "perl -i -n -p -e \"s/^(\s*Alias\s*=.*)/#\1\" /etc/systemd/system/$MYSQL_SERVICE_FILE" >> ${logdir}/main.log
+         perl -i -n -p -e "s/^(\s*Alias\s*=.*)/#\1" /etc/systemd/system/$MYSQL_SERVICE_FILE >> ${logdir}/main.log 2>&1
+      fi
+
+   fi # if $PARALLEL_INSTALLATION ; then
+
    echononl "Aktiviere den MySQL Datenbank Service für den automatischem Start.."
    echo "" >> ${logdir}/main.log
    echo "## - Aktiviere den MySQL Datenban Service für den automatischem Start" >> ${logdir}/main.log
@@ -4778,8 +4946,14 @@ else
    echo "" >> ${logdir}/main.log
    echo "## - Erstelle Symlink \"/etc/init.d/${MYSQL_SYSV_INIT_SCRIPT}\"" >> ${logdir}/main.log
    echo "## -" >> ${logdir}/main.log
-   echo "ln -s \"$(dirname $MYSQL_INSTALL_DIR)/mysql/support-files/${MYSQL_SYSV_INIT_SCRIPT}\" \"/etc/init.d/${MYSQL_SYSV_INIT_SCRIPT}\"" >> ${logdir}/main.log
-   ln -s "$(dirname $MYSQL_INSTALL_DIR)/mysql/support-files/${MYSQL_SYSV_INIT_SCRIPT}" /etc/init.d/${MYSQL_SYSV_INIT_SCRIPT} >> ${logdir}/main.log 2>&1
+
+   if $PARALLEL_INSTALLATION ; then
+      echo "ln -s \"${MYSQL_INSTALL_DIR}/support-files/${SUPPORT_FILE_INIT_SCRIPT}\" \"/etc/init.d/${MYSQL_SYSV_INIT_SCRIPT}\"" >> ${logdir}/main.log
+      ln -s "${MYSQL_INSTALL_DIR}/support-files/${SUPPORT_FILE_INIT_SCRIPT}" /etc/init.d/${MYSQL_SYSV_INIT_SCRIPT} >> ${logdir}/main.log 2>&1
+   else
+      echo "ln -s \"$(dirname $MYSQL_INSTALL_DIR)/mysql/support-files/${MYSQL_SYSV_INIT_SCRIPT}\" \"/etc/init.d/${MYSQL_SYSV_INIT_SCRIPT}\"" >> ${logdir}/main.log
+      ln -s "$(dirname $MYSQL_INSTALL_DIR)/mysql/support-files/${MYSQL_SYSV_INIT_SCRIPT}" /etc/init.d/${MYSQL_SYSV_INIT_SCRIPT} >> ${logdir}/main.log 2>&1
+   fi
    if [ "$?" = "0" ]; then
       echo_ok
    else
@@ -4933,8 +5107,8 @@ if ! $UPDATE_MYSQL ; then
    echo "" >> ${logdir}/main.log
    echo "## - Delete rows with empty 'User' from table mysql.user" >> ${logdir}/main.log
    echo "## - " >> ${logdir}/main.log
-   echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e \"DELETE FROM user where User = ''\"" >> ${logdir}/main.log
-   ${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e "DELETE FROM user where User = ''" >> ${logdir}/main.log 2>&1
+   echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e \"DELETE FROM user where User = ''\"" >> ${logdir}/main.log
+   ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e "DELETE FROM user where User = ''" >> ${logdir}/main.log 2>&1
    if [[ $? -eq 0 ]]; then
       echo_ok
    else
@@ -4958,8 +5132,8 @@ if ! $UPDATE_MYSQL ; then
       echo "" >> ${logdir}/main.log
       echo "## - Delete database 'test'.." >> ${logdir}/main.log
       echo "## - " >> ${logdir}/main.log
-      echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e \"DROP DATABASE test\"" >> ${logdir}/main.log
-      ${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e "DROP DATABASE test" >> ${logdir}/main.log 2>&1
+      echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e \"DROP DATABASE test\"" >> ${logdir}/main.log
+      ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e "DROP DATABASE test" >> ${logdir}/main.log 2>&1
       if [[ $? -eq 0 ]]; then
          echo_ok
       else
@@ -4980,8 +5154,8 @@ if ! $UPDATE_MYSQL ; then
       echo "" >> ${logdir}/main.log
       echo "## - Delete rows concerning database 'test' from table 'mysql.db'.." >> ${logdir}/main.log
       echo "## - " >> ${logdir}/main.log
-      echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e \"DELETE FROM db WHERE Db LIKE 'test%'\"" >> ${logdir}/main.log
-      ${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e "DELETE FROM db WHERE Db LIKE 'test%'" >> ${logdir}/main.log 2>&1
+      echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e \"DELETE FROM db WHERE Db LIKE 'test%'\"" >> ${logdir}/main.log
+      ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e "DELETE FROM db WHERE Db LIKE 'test%'" >> ${logdir}/main.log 2>&1
       if [[ $? -eq 0 ]]; then
          echo_ok
       else
@@ -5011,9 +5185,9 @@ if ! $UPDATE_MYSQL ; then
 		echo "" >> ${logdir}/main.log
 		echo "## - Setze root Passwort für den MariaDB Zugang" >> ${logdir}/main.log
 		echo "## -" >> ${logdir}/main.log
-		echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e \"UPDATE user SET Password = password('$MYSQL_ROOT_PW') WHERE User = 'root'\"" >> ${logdir}/main.log
+		echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e \"UPDATE user SET Password = password('$MYSQL_ROOT_PW') WHERE User = 'root'\"" >> ${logdir}/main.log
 
-		${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e "UPDATE user SET Password = password('$MYSQL_ROOT_PW') WHERE User = 'root'" \
+		${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e "UPDATE user SET Password = password('$MYSQL_ROOT_PW') WHERE User = 'root'" \
 			>> ${logdir}/main.log 2>&1
 		if [ "$?" = "0" ]; then
 			echo_ok
@@ -5037,8 +5211,8 @@ if ! $UPDATE_MYSQL ; then
       echo "" >> ${logdir}/main.log
       echo "## - Neu Einlesen der Berechtigung (MySQL Server)" >> ${logdir}/main.log
       echo "## -" >> ${logdir}/main.log
-      echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e \"FLUSH PRIVILEGES\"" >> ${logdir}/main.log
-      ${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e "FLUSH PRIVILEGES" >> ${logdir}/main.log 2>&1
+      echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e \"FLUSH PRIVILEGES\"" >> ${logdir}/main.log
+      ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e "FLUSH PRIVILEGES" >> ${logdir}/main.log 2>&1
       if [ "$?" = "0" ]; then
          echo_ok
       else
@@ -5063,9 +5237,9 @@ if ! $UPDATE_MYSQL ; then
          echo "" >> ${logdir}/main.log
          echo "## - Setze root Passwort für den MySQL Zugang" >> ${logdir}/main.log
          echo "## -" >> ${logdir}/main.log
-         echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e \"UPDATE user SET authentication_string = password('$MYSQL_ROOT_PW') WHERE User = 'root'\"" >> ${logdir}/main.log
+         echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e \"UPDATE user SET authentication_string = password('$MYSQL_ROOT_PW') WHERE User = 'root'\"" >> ${logdir}/main.log
 
-         ${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e "UPDATE user SET authentication_string = password('$MYSQL_ROOT_PW') WHERE User = 'root'" \
+         ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e "UPDATE user SET authentication_string = password('$MYSQL_ROOT_PW') WHERE User = 'root'" \
             >> ${logdir}/main.log 2>&1
          if [ "$?" = "0" ]; then
             echo_ok
@@ -5089,8 +5263,8 @@ if ! $UPDATE_MYSQL ; then
          echo "" >> ${logdir}/main.log
          echo "## - Neu Einlesen der Berechtigung (MySQL Server)" >> ${logdir}/main.log
          echo "## -" >> ${logdir}/main.log
-         echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e \"FLUSH PRIVILEGES\"" >> ${logdir}/main.log
-         ${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e "FLUSH PRIVILEGES" >> ${logdir}/main.log 2>&1
+         echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e \"FLUSH PRIVILEGES\"" >> ${logdir}/main.log
+         ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot mysql -N -s -e "FLUSH PRIVILEGES" >> ${logdir}/main.log 2>&1
          if [ "$?" = "0" ]; then
             echo_ok
          else
@@ -5114,8 +5288,8 @@ if ! $UPDATE_MYSQL ; then
          echo "" >> ${logdir}/main.log
          echo "## - Neu Einlesen der Berechtigung (MySQL Server)" >> ${logdir}/main.log
          echo "## -" >> ${logdir}/main.log
-         echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e \"FLUSH PRIVILEGES\"" >> ${logdir}/main.log
-         ${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e "FLUSH PRIVILEGES" >> ${logdir}/main.log 2>&1
+         echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET  -uroot mysql -N -s -e \"FLUSH PRIVILEGES\"" >> ${logdir}/main.log
+         ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET  -uroot mysql -N -s -e "FLUSH PRIVILEGES" >> ${logdir}/main.log 2>&1
          if [ "$?" = "0" ]; then
             echo_ok
          else
@@ -5136,9 +5310,9 @@ if ! $UPDATE_MYSQL ; then
          echo "" >> ${logdir}/main.log
          echo "## - Setze root Passwort für den MySQL Zugang" >> ${logdir}/main.log
          echo "## -" >> ${logdir}/main.log
-         echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e \"ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '$MYSQL_ROOT_PW'\"" >> ${logdir}/main.log
+         echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET  -uroot mysql -N -s -e \"ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '$MYSQL_ROOT_PW'\"" >> ${logdir}/main.log
 
-         ${MYSQL_INSTALL_DIR}/bin/mysql -uroot mysql -N -s -e "ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '$MYSQL_ROOT_PW'" \
+         ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET  -uroot mysql -N -s -e "ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '$MYSQL_ROOT_PW'" \
             >> ${logdir}/main.log 2>&1
          if [ "$?" = "0" ]; then
             echo_ok
@@ -5281,60 +5455,14 @@ if ! $UPDATE_MYSQL || $_sys_maint_cnf_needed ; then
 
    _maint_user=sys-maint
 
-   if [[ "$MYSQL_DISTRIBUTION" = "MariaDB" ]]; then
+   if [[ "$MYSQL_MAJOR_VERSION" -lt 8 ]] || [[ "$MYSQL_DISTRIBUTION" = "MariaDB" ]]; then
 
       echononl "Erstelle maintance MySQL User '${_maint_user}' - localhost.."
       echo "" >> ${logdir}/main.log
       echo "## - Erstelle maintance MySQL User '${_maint_user}' - localhost" >> ${logdir}/main.log
       echo "" >> ${logdir}/main.log
-      echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"CREATE USER '${_maint_user}'@'localhost' IDENTIFIED BY '$_maint_passwd'\"" >> ${logdir}/main.log
-      ${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "CREATE USER '${_maint_user}'@'localhost' IDENTIFIED BY '$_maint_passwd'" >> ${logdir}/main.log 2>&1
-      if [ "$?" = "0" ]; then
-         echo_ok
-      else
-         echo_failed
-         error Konnte \(MySQL\) User \"${_maint_user}\" nicht erstellen..
-
-         echononl "continue anyway [yes/no]: "
-         read OK
-         OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
-         while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
-            echononl "Wrong entry! - repeat [yes/nno]: "
-            read OK
-         done
-         [[ $OK = "yes" ]] || fatal "Abbruch durch User"
-      fi
-
-      echononl "Set (all) privileges to MySQL User '${_maint_user}' - localhost.."
-      echo "" >> ${logdir}/main.log
-      echo "## - Set (all) privileges to MySQL User '${_maint_user}' - localhost" >> ${logdir}/main.log
-      echo "" >> ${logdir}/main.log
-      echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"GRANT ALL ON *.* TO '${_maint_user}'@'localhost'\"" >> ${logdir}/main.log
-      ${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "GRANT ALL ON *.* TO '${_maint_user}'@'localhost'" >> ${logdir}/main.log 2>&1
-      if [ "$?" = "0" ]; then
-         echo_ok
-      else
-         echo_failed
-         error Konnte \(MySQL\) User \"${_maint_user}\" nicht erstellen..
-
-         echononl "continue anyway [yes/no]: "
-         read OK
-         OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
-         while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
-            echononl "Wrong entry! - repeat [yes/nno]: "
-            read OK
-         done
-         [[ $OK = "yes" ]] || fatal "Abbruch durch User"
-      fi
-
-   elif [[ "$MYSQL_MAJOR_VERSION" -lt 8 ]]; then
-
-      echononl "Erstelle maintance MySQL User '${_maint_user}' - localhost.."
-      echo "" >> ${logdir}/main.log
-      echo "## - Erstelle maintance MySQL User '${_maint_user}' - localhost" >> ${logdir}/main.log
-      echo "" >> ${logdir}/main.log
-      echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"GRANT ALL ON *.* TO '${_maint_user}'@'localhost' IDENTIFIED BY '$_maint_passwd'\"" >> ${logdir}/main.log
-      ${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "GRANT ALL ON *.* TO '${_maint_user}'@'localhost' IDENTIFIED BY '$_maint_passwd'" >> ${logdir}/main.log 2>&1
+      echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"GRANT ALL ON *.* TO '${_maint_user}'@'localhost' IDENTIFIED BY '$_maint_passwd'\"" >> ${logdir}/main.log
+      ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "GRANT ALL ON *.* TO '${_maint_user}'@'localhost' IDENTIFIED BY '$_maint_passwd'" >> ${logdir}/main.log 2>&1
       if [ "$?" = "0" ]; then
          echo_ok
       else
@@ -5357,8 +5485,8 @@ if ! $UPDATE_MYSQL || $_sys_maint_cnf_needed ; then
       echo "" >> ${logdir}/main.log
       echo "## - Erstelle maintance MySQL User '${_maint_user}' - localhost" >> ${logdir}/main.log
       echo "" >> ${logdir}/main.log
-      echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"CREATE USER '${_maint_user}'@'localhost' IDENTIFIED WITH mysql_native_password BY '$_maint_passwd'\"" >> ${logdir}/main.log
-      ${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "CREATE USER '${_maint_user}'@'localhost' IDENTIFIED WITH mysql_native_password BY '$_maint_passwd'" >> ${logdir}/main.log 2>&1
+      echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"CREATE USER '${_maint_user}'@'localhost' IDENTIFIED WITH mysql_native_password BY '$_maint_passwd'\"" >> ${logdir}/main.log
+      ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "CREATE USER '${_maint_user}'@'localhost' IDENTIFIED WITH mysql_native_password BY '$_maint_passwd'" >> ${logdir}/main.log 2>&1
       if [ "$?" = "0" ]; then
          echo_ok
       else
@@ -5379,8 +5507,8 @@ if ! $UPDATE_MYSQL || $_sys_maint_cnf_needed ; then
       echo "" >> ${logdir}/main.log
       echo "## - Set (all) privileges to MySQL User '${_maint_user}' - localhost" >> ${logdir}/main.log
       echo "" >> ${logdir}/main.log
-      echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"GRANT ALL ON *.* TO '${_maint_user}'@'localhost'\"" >> ${logdir}/main.log
-      ${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "GRANT ALL ON *.* TO '${_maint_user}'@'localhost'" >> ${logdir}/main.log 2>&1
+      echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"GRANT ALL ON *.* TO '${_maint_user}'@'localhost'\"" >> ${logdir}/main.log
+      ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "GRANT ALL ON *.* TO '${_maint_user}'@'localhost'" >> ${logdir}/main.log 2>&1
       if [ "$?" = "0" ]; then
          echo_ok
       else
@@ -5397,14 +5525,14 @@ if ! $UPDATE_MYSQL || $_sys_maint_cnf_needed ; then
          [[ $OK = "yes" ]] || fatal "Abbruch durch User"
       fi
 
-   fi # if [[ "$MYSQL_DISTRIBUTION" = "MariaDB" ]]
+   fi # if [[ "$MYSQL_MAJOR_VERSION" -lt 8 ]]
 
    echononl "Give 'Grant' permission to MySQL User '${_maint_user}'.."
    echo "" >> ${logdir}/main.log
    echo "## - Give 'Grant' permission to MySQL User '${_maint_user}'" >> ${logdir}/main.log
    echo "## -" >> ${logdir}/main.log
-   echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"UPDATE user SET Grant_priv = 'y' WHERE user = '${_maint_user}';\"" >> ${logdir}/main.log
-   ${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "UPDATE user SET Grant_priv = 'y' WHERE user = '${_maint_user}';" >> ${logdir}/main.log 2>&1
+   echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"UPDATE user SET Grant_priv = 'y' WHERE user = '${_maint_user}';\"" >> ${logdir}/main.log
+   ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "UPDATE user SET Grant_priv = 'y' WHERE user = '${_maint_user}';" >> ${logdir}/main.log 2>&1
    if [ "$?" = "0" ]; then
       echo_ok
    else
@@ -5425,8 +5553,8 @@ if ! $UPDATE_MYSQL || $_sys_maint_cnf_needed ; then
    echo "" >> ${logdir}/main.log
    echo "## - Neu Einlesen der Berechtigung (MySQL Server)" >> ${logdir}/main.log
    echo "## -" >> ${logdir}/main.log
-   echo "${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"FLUSH PRIVILEGES\"" >> ${logdir}/main.log
-   ${MYSQL_INSTALL_DIR}/bin/mysql -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "FLUSH PRIVILEGES" >> ${logdir}/main.log 2>&1
+   echo "${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot -p$MYSQL_ROOT_PW mysql -N -s -e \"FLUSH PRIVILEGES\"" >> ${logdir}/main.log
+   ${MYSQL_INSTALL_DIR}/bin/mysql -S $MYSQL_UNIX_SOCKET -uroot -p$MYSQL_ROOT_PW mysql -N -s -e "FLUSH PRIVILEGES" >> ${logdir}/main.log 2>&1
    if [ "$?" = "0" ]; then
       echo_ok
    else
@@ -5484,12 +5612,17 @@ EOF
 fi
 
 
+if $PARALLEL_INSTALLATION ; then
+   _logrotate_file=/etc/logrotate.d/${MYSQL_DISTRIBUTION,,}-$MYSQL_VERSION
+else
+   _logrotate_file=/etc/logrotate.d/mysql
+fi
 sys_maint_file="$(dirname $MYSQL_INSTALL_DIR)/mysql/sys-maint.cnf"
-echononl "Erstelle Logrotate Definitionsdatei '/etc/logrotate.d/mysql'.."
+echononl "Erstelle Logrotate Definitionsdatei '$_logrotate_file'.."
 echo "" >> ${logdir}/main.log
-echo "## - Erstelle Logrotate Definitionsdatei /etc/logrotate.d/mysql" >> ${logdir}/main.log
+echo "## - Erstelle Logrotate Definitionsdatei $_logrotate_file" >> ${logdir}/main.log
 echo "## -" >> ${logdir}/main.log
-echo "cat << EOF > /etc/logrotate.d/mysql
+echo "cat << EOF > $_logrotate_file
 $_mysql_log
 $_mysql_error_log
 $_mysql_slow_query_log
@@ -5512,7 +5645,7 @@ $_mysql_slow_query_log
 }
 EOF" >> ${logdir}/main.log
 
-cat << EOF > /etc/logrotate.d/mysql
+cat << EOF > $_logrotate_file
 $_mysql_log
 $_mysql_error_log
 $_mysql_slow_query_log